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Using Frostbolt in instances is a big help because it slows enemies down. Of course Frost specs will be successful.
I think you missed the point by a large margin.
selective talents taken for AOE grinding can cause you to miss some rather good talents e.g threat reduction talents however, if you monitor your agro etc well in an instance, especially low level instances which as it seems you will be doing for a while you should be fine, i did it up to level 40 then i basically quit aoe grinding. After 60 you should respec to a instancing/solo pve kind of build as there isnt many area's to safely aoe grind in outlands. so thats a heads up.